Magnetic flux studies in horizontally cooled elliptical superconducting cavities

Checchin, M.; Crawford, A. C.; Melnychuk, O.; Romanenko, A.; Sergatskov, D. A.

doi:10.1063/1.4927519

Title: Magnetic flux studies in horizontally cooled elliptical superconducting cavities

Journal Article · Tue Jul 28 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4927519· OSTI ID:22494656

Checchin, M. ^[1]; Crawford, A. C.; Melnychuk, O.; Romanenko, A.; Sergatskov, D. A. ^[1]

Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)

Previous studies on magnetic flux expulsion as a function of cooldown procedures for elliptical superconducting radio frequency (SRF) niobium cavities showed that when the cavity beam axis is placed parallel to the helium cooling flow and sufficiently large thermal gradients are achieved, all magnetic flux could be expelled and very low residual resistance could be achieved. In this paper, we investigate flux trapping for the case of resonators positioned perpendicularly to the helium cooling flow, which is more representative of how SRF cavities are cooled in accelerators and for different directions of the applied magnetic field surrounding the resonator. We show that different field components have a different impact on the surface resistance, and several parameters have to be considered to fully understand the flux dynamics. A newly discovered phenomenon of concentration of flux lines at the cavity top leading to temperature rise at the cavity equator is presented.

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OSTI ID:: 22494656

Journal Information:: Journal of Applied Physics, Vol. 118, Issue 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979

Country of Publication:: United States

Language:: English

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Cited By (5)

Efficient expulsion of magnetic flux in superconducting radiofrequency cavities for high Q ₀ applications Posen, S.; Checchin, M.; Crawford, A. C. Journal of Applied Physics, Vol. 119, Issue 21 https://doi.org/10.1063/1.4953087	journal	June 2016
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium Martinello, M.; Grassellino, A.; Checchin, M. Applied Physics Letters, Vol. 109, Issue 6 https://doi.org/10.1063/1.4960801	journal	August 2016
Flux trapping in superconducting accelerating cavities during cooling down with a spatial temperature gradient Kubo, Takayuki Progress of Theoretical and Experimental Physics, Vol. 2016, Issue 5 https://doi.org/10.1093/ptep/ptw049	journal	May 2016
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium Martinello, M.; Grassellino, A.; Checchin, M. arXiv https://doi.org/10.48550/arxiv.1606.04174	text	January 2016
Nonlinear Dynamics and Dissipation of a Curvilinear Vortex Driven by a Strong Time-Dependent Meissner Current Pathirana, W. P. M. R.; Gurevich, A. arXiv https://doi.org/10.48550/arxiv.2001.08836	text	January 2020

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